Graco 312888D Ar Pour Gun Users Manual Gun, Operartion Parts, English

2015-04-02

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Operation - Parts

AR Pour Gun
For use with non-flammable polyurethane foams.
Not for use in explosive atmospheres.

Part No. 255828
2000 psi (13.8 MPa, 138 bar) Maximum Working Pressure
Important Safety Instructions
Read all warnings and instructions in this manual.
Save these instructions.

312888D

Contents
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Isocyanate Hazard . . . . . . . . . . . . . . . . . . . . . . . . . 5
Material Self-ignition . . . . . . . . . . . . . . . . . . . . . . . 5
Moisture Sensitivity of Isocyanates . . . . . . . . . . . . 5
Keep Components A and B Separate . . . . . . . . . . 5
Foam Resins with 245 fa Blowing Agents . . . . . . . 5
Changing Materials . . . . . . . . . . . . . . . . . . . . . . . . . 5
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Operation Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Safety Stop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Air Hose Connection . . . . . . . . . . . . . . . . . . . . . . 8
Coupling Block . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Initial Set Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Daily Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Daily Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Pressure Relief Procedure . . . . . . . . . . . . . . . . . . 12
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Gun Service Kits . . . . . . . . . . . . . . . . . . . . . . . . 13
Daily Cleaning Procedure,
with Gun Service Kit . . . . . . . . . . . . . . . . . 13
Daily Cleaning Procedure,
without Gun Service Kit . . . . . . . . . . . . . . . 14
Flush Gun . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Trigger Gun While Disconnected . . . . . . . . . . . 14
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Pattern Control Tip . . . . . . . . . . . . . . . . . . . . . . 16
Screen Screw and Port Closure Plugs . . . . . . . 16
Valving Rod and Resilient Sleeve . . . . . . . . . . . 17
Coupling Block and Check Valves . . . . . . . . . . . 18
Impingers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Gun Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Pressure Check Valving Rod Resilient Sleeve . 21
Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
AR Pour Gun 255828 . . . . . . . . . . . . . . . . . . . . 23
AR-D Conversion Kit 24A023 . . . . . . . . . . . . . . 29
Electrical Diagram . . . . . . . . . . . . . . . . . . . . . . . . 30
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Performance Charts . . . . . . . . . . . . . . . . . . . . . . . 31
Graco Standard Warranty . . . . . . . . . . . . . . . . . . . 32
Graco Information . . . . . . . . . . . . . . . . . . . . . . . . . 32

312888D

Warnings

Warnings
The following warnings are for the setup, use, grounding, maintenance, and repair of this equipment. The exclamation point symbol alerts you to a general warning and the hazard symbol refers to procedure-specific risk. Refer back
to these warnings. Additional, product-specific warnings may be found throughout the body of this manual where
applicable.

WARNING
TOXIC FLUID OR FUMES HAZARD
Toxic fluids or fumes can cause serious injury or death if splashed in the eyes or on skin, inhaled, or
swallowed.
• Read MSDS’s to know the specific hazards of the fluids you are using.
• Store hazardous fluid in approved containers, and dispose of it according to applicable guidelines.
• Always wear impervious gloves when spraying or cleaning equipment.
PERSONAL PROTECTIVE EQUIPMENT
You must wear appropriate protective equipment when operating, servicing, or when in the operating
area of the equipment to help protect you from serious injury, including eye injury, inhalation of toxic
fumes, burns, and hearing loss. This equipment includes but is not limited to:
• Protective eyewear
• Clothing and respirator as recommended by the fluid and solvent manufacturer
• Gloves
• Hearing protection
SKIN INJECTION HAZARD
High-pressure fluid from dispense valve, hose leaks, or ruptured components will pierce skin. This may
look like just a cut, but it is a serious injury that can result in amputation. Get immediate surgical
treatment.
• Do not point dispense valve at anyone or at any part of the body.
• Do not put your hand over the end of the dispense nozzle.
• Do not stop or deflect leaks with your hand, body, glove, or rag.
• Follow Pressure Relief Procedure in this manual, when you stop spraying and before cleaning,
checking, or servicing equipment.
• Tighten all fluid connections before operating the equipment.
• Check hoses tubes and couplings daily. Replace worn or damaged parts immediately.

312888D

Warnings

WARNING
FIRE AND EXPLOSION HAZARD
Flammable fumes, such as solvent and paint fumes, in work area can ignite or explode. To help prevent
fire and explosion:
• Use and clean equipment only in well ventilated area.
• Eliminate all ignition sources; such as pilot lights, cigarettes, portable electric lamps, and plastic drop
cloths (potential static arc).
• Keep work area free of debris, including solvent, rags and gasoline.
• Do not plug or unplug power cords or turn lights on or off when flammable fumes are present.
• Ground equipment, personnel, object being sprayed, and conductive objects in work area. See
Grounding instructions.
• Use only Graco grounded hoses.
• Check gun resistance daily.
• If there is static sparking or you feel a shock, stop operation immediately. Do not use equipment
until you identify and correct the problem.
• Do not flush with gun electrostatics on. Do not turn on electrostatics until all solvent is removed from
system.
• Keep a working fire extinguisher in the work area.

EQUIPMENT MISUSE HAZARD
Misuse can cause death or serious injury.
• Do not operate the unit when fatigued or under the influence of drugs or alcohol.
• Do not exceed the maximum working pressure or temperature rating of the lowest rated
system component. See Technical Data in all equipment manuals.
• Use fluids and solvents that are compatible with equipment wetted parts. See Technical
Data in all equipment manuals. Read fluid and solvent manufacturer’s warnings. For complete information about your material, request MSDS forms from distributor or retailer.
• Check equipment daily. Repair or replace worn or damaged parts immediately with genuine
manufacturer’s replacement parts only.
• Do not alter or modify equipment.
• Use equipment only for its intended purpose. Call your distributor for information.
• Route hoses and cables away from traffic areas, sharp edges, moving parts, and hot surfaces.
• Do not kink or over bend hoses or use hoses to pull equipment.
• Keep children and animals away from work area.
• Comply with all applicable safety regulations.

312888D

Isocyanate Hazard

•

Keep the ISO lube pump reservoir (if installed) filled
with Graco Throat Seal Liquid (TSL), Part 206995.
The lubricant creates a barrier between the ISO and
the atmosphere.

•
Spraying materials containing isocyanates creates
potentially harmful mists, vapors, and atomized particulates.

Use moisture-proof hoses specifically designed for
ISO, such as those supplied with your system.

•

Read material manufacturer’s warnings and material
MSDS to know specific hazards and precautions
related to isocyanates.

Never use reclaimed solvents, which may contain
moisture. Always keep solvent containers closed
when not in use.

•

Never use solvent on one side if it has been contaminated from the other side.

•

Always lubricate threaded parts with ISO pump oil
or grease when reassembling.

Prevent inhalation of isocyanate mists, vapors, and
atomized particulates by providing sufficient ventilation in the work area. If sufficient ventilation is not
available, a supplied-air respirator is required for
everyone in the work area.
To prevent contact with isocyanates, appropriate personal protective equipment, including chemically
impermeable gloves, boots, aprons, and goggles, is
also required for everyone in the work area.

Keep Components A and
B Separate
CAUTION
To prevent cross-contamination of the equipment’s
wetted parts, never interchange component A (isocyanate) and component B (resin) parts.

Material Self-ignition
Some materials may become self-igniting if applied
too thickly. Read material manufacturer’s warnings
and material MSDS.

Moisture Sensitivity of
Isocyanates
Isocyanates (ISO) are catalysts used in two component
foam and polyurea coatings. ISO will react with moisture
(such as humidity) to form small, hard, abrasive crystals,
which become suspended in the fluid. Eventually a film
will form on the surface and the ISO will begin to gel,
increasing in viscosity. If used, this partially cured ISO
will reduce performance and the life of all wetted parts.
The amount of film formation and rate of crystallization varies depending on the blend of ISO, the
humidity, and the temperature.

Foam Resins with 245 fa
Blowing Agents
New foam blowing agents will froth at temperatures
above 90°F (33°C) when not under pressure, especially
if agitated. To reduce frothing, minimize preheating in a
circulation system.

Changing Materials
•

When changing materials, flush the equipment multiple times to ensure it is thoroughly clean.

•

Always clean the fluid inlet strainers after flushing.

•

Check with your material manufacturer for chemical
compatibility.

•

Most materials use ISO on the A side, but some use
ISO on the B side.

•

Epoxies often have amines on the B (hardener)
side. Polyureas often have amines on the B (resin)
side.

To prevent exposing ISO to moisture:

•

Always use a sealed container with a desiccant
dryer in the vent, or a nitrogen atmosphere. Never
store ISO in an open container.

312888D

Components

Components
F

Overall View

C
D
A

U
Q

Gun Block

P
V

W
X

Z
AB

AE
AC

AD
Key:
A Manual Valves
B Gun Block
C Coupling Block
D Trigger
E Valving Rod
F Piston Rod
G Safety Stop
H Pattern Control Tip
J Front Packing
K O-ring
L Front Impinger
M Throat
N Rear Impinger
P Screen Screw Mounting Screw
Q R-Port Closure Screw
6

R
S
T
U
V
W
X
Y
Z
AA
AB
AC
AD
AE

Gun Block
Resin Seal Retainer
Spacer
Resin Seal Screw
O-ring
Resin Packing
A-Port Closure Screw
Gun Block Screen
Gun Block Screen Screw
Screen Screw Seal
Snap Ring
A-Check Valve
Coupling Block Gaskets
R-Check Valve

312888D

Operation Basics

Operation Basics
Safety Stop
To prevent accidental gun operation, always disconnect air supply before servicing gun or anytime gun is
not in use.

The gun has a two-position safety stop. The SERVICE
(CLOSED) position permits both material inlet ports to
remain closed when gun is triggered.
Safety Stop

Grounding

Check your local electrical code and your proportioner
manual for detailed grounding instructions.
Ground the spray gun through connection to a
Graco-approved grounded fluid supply hose.

Engage Safety Stop
To engage safety stop, push in and turn clockwise to
CLOSED (rear detent) position, then release.
Disengage Safety Stop
To disengage safety stop, push in and turn counterclockwise to place in OPEN (forward detent) position, then
release.

312888D

Operation Basics

Air Hose Connection
Connect Air Hoses
Pull back sleeve of female fitting, insert male fitting and
slide sleeve forward to secure connection.

1. Open manual valves using 5/16 in. nut driver; turn
manual valves counterclockwise approximately
three full turns. Do not open until it bottoms out.
2. Close manual valves by turning fully clockwise.

Disconnect Air Hoses
Pull back sleeve of female fitting and pull out male fitting.

Pull Sleeve

Manual Valves

Coupling Block

Removal and Installation

Chemical hoses are joined to gun block by coupling
block to ease installation and removal of gun.

Manual Valves
Triggering gun with manual valves closed may
cause crossover if gun ports contain residual chemical.

To prevent release of pressurized chemicals, close
both manual valves before removing coupling block.

Remove Coupling Block
1. Set safety stop to SERVICE (CLOSED).
2. Disconnect air hose.
3. Close both manual valves.

To prevent release of pressurized chemicals, never
open manual valves unless coupling block is secured
to gun or exit port is directed into flush pail.

4. Remove coupling block mounting screw.
5. Separate coupling block from gun.
6. Wipe mating surfaces of gun block and coupling
block to remove residual chemical.

312888D

Operation Basics

7. Cover exposed openings with grease.

Coupling
Block

Install Coupling Block
Replace nicked, damaged, or worn coupling block gaskets.
1. With gaskets in place, fit coupling block to gun
block.
2. Insert coupling block mounting screw and use
5/16 in. nut driver to tighten to gun block.

312888D

Initial Set Up

1. Remove coupling block from gun.
2. Check valving rod clearance in closed position. Rod
should extend approximately 1/32 in. (1 mm)
beyond tip of mixing chamber.
3. Adjust valving rod travel to initial setting. See Valving Rod and Resilient Sleeve, page 17.
4. Connect air supply hose to gun.
5. Connect A-isocyanate hose (red-taped) to notched
fitting on coupling block. Then connect R-resin hose
(blue-taped) to fitting without notches on coupling
block.
6. Close both manual valves.
7. Pressurize the A and R chemical hoses and check
for leaks. (See Proportioning Unit manual.)
8. Bleed air from chemical hoses:
a. Hold coupling block with exit ports pointed into
disposable container.
b.

Open each manual valve to allow trapped air to
escape. Bleed each side until chemical is free of
air.

Close both manual valves.

9. Use clean cloth soaked in gun cleaner to wipe clean
coupling block and its mating surfaces.
CAUTION
To avoid accumulation of dirt and other contaminants,
do not apply grease to mating surfaces of coupling
block.
10. Install coupling block to gun block.
11. Proceed with Daily Start-up procedure or Shutdown
procedure as required.

312888D

Daily Start-Up

Ensure gun is attached to coupling block and air hose,
and the proportioning unit is at desired temperature
and pressure.

1. Ensure gun is mounted onto gun block.

Daily Shutdown

Follow daily shutdown when gun is out of service
for any length of time. Daily disassembly of gun for
cleaning is not recommended if it has been operating properly. However, if you remove the gun from
the coupling block, flush and clean thoroughly.

2. Connect air supply to gun; see Air Hose Connection, page 8.
3. Connect electrical harness to gun.
4. Trigger gun multiple times to ensure valving rod
moves through its full travel quickly and freely.
CAUTION
Sluggish valving rod action may result in valving rod
sticking in open position when fluid pressure is
applied. Always have a 5/16 in. nut driver available to
quickly close manual valves on coupling block.
5. Open both manual valves; see Manual Valves,
page 8.

1. Set safety stop to OPEN.
2. Close both manual valves.
3. Disconnect air supply from gun.
4. Shutdown proportioning unit as required. See Proportioner manual.
5. Clean as required.
Do not disassemble gun daily for cleaning if it is
operating properly. However, if gun is removed from
coupling block, it must be flushed and cleaned thoroughly.

6. Test spray on disposable surface and adjust spray
pattern as needed.
Do not exceed 2000 psi (13.8 MPa, 138 bar) maximum fluid working pressure even in static de-triggered conditions, or check valve damage may
result.

312888D

Pressure Relief Procedure

Relieve pressure before cleaning or repairing gun.
1. Close both manual valves.

Manual Valves
2. Set safety stop to OPEN.
3. Trigger gun onto cardboard or into waste container
to relieve pressure.
4. Release gun trigger, set safety stop to SERVICE
(CLOSED), and close manual valves.

If fluid in hose and proportioner is still under pressure,
follow Pressure Relief Procedure in your Proportioner
manual.
To relieve pressure in hose after gun is removed, place
fluid manifold over containers, facing away from you.
Very carefully open fluid valves. Under high pressure,
fluid will spray sideways from fluid ports.

312888D

Maintenance

Maintenance
Gun Service Kits
Use either the 1-Quart Gun Service Kit (296980) or
3-Gallon Gun Service Kit (296981) to perform daily
flushing of spray gun without disassembly.

Daily Cleaning Procedure,
with Gun Service Kit

To avoid static sparking that may result in fire or explosion, ensure all equipment in cleaning procedure is
grounded. Do not clean on or near foamed or coated
surfaces or any other flammable surfaces or objects.

1. Set safety stop to SERVICE (CLOSED).

1-Quart Kit

2. Close both manual valves.
3. Remove gun from coupling block.

For more information about the 1-Quart Gun Service Kit,
see Manual 311340.

4. Disconnect air and electric.
5. Attach service block of gun service kit to gun, and
then tighten using 5/16 in. nut driver.
6. Pressurize Service Kit container up to 100 psi. Do
not exceed 100 psi (0.7 MPa, 7 bar).
7. Open one manual valve on service block.
8. Connect air to gun. Set safety stop to OPEN.
9. Hold gun against grounded waste container.

3-Gallon Kit
For more information about the 3-Gallon Gun Service
Kit, see Manual 311340.

10. Trigger gun and 1-Quart Gun Service Kit. Spray into
waste container until there is a fine, unobstructed
mist of gun cleaner.
11. Release trigger and close manual valve on service
block.
12. Repeat steps 7-11 for other side of gun.
13. Remove service block of gun service kit from spray
gun.
14. Set safety to SERVICE (CLOSED).
15. Disconnect air supply.
16. Clean removed component parts.
Do not use metal cleaning devices to clean plastic
components.

312888D

Maintenance

Daily Cleaning Procedure,
without Gun Service Kit
If the Gun Service Kit is not available, the iso side components must be cleaned daily.
See AR Gun Tool Kit 253728 on page 28.

1. Place safety stop in SERVICE (CLOSED) position.
2. Remove pattern control tip.
3. Remove front impinger, packing, and o-ring from
pattern control tip.
4. Using pattern control tip/impinger cleanout tool
(607), clean the inside bore of the pattern control tip
by inserting and spinning.
5. Using cleanout spade (609), clean the front
impinger by sliding through slots. Clean inside bore
of the impinger as necessary.
6. Inspect packing for built-up iso and deformities and
replace as necessary.
7. Inspect o-ring for flat areas and replace as necessary.
8. Remove screen screw then remove screen from
screen screw. Inspect gasket and replace as necessary.

Flush Gun

To avoid static sparking that may result in fire or explosion, ensure all equipment in flushing procedure is
grounded. Do not flush on or near foamed or coated
surfaces.

1. Set safety stop to SERVICE (CLOSED).
2. Close both manual valves.
3. Loosen screen screw and then remove by hand.
4. Use flush can to thoroughly flush screen screw and
screen screw cavity.
5. Service gun by following Troubleshooting procedures, page 15.

Trigger Gun While Disconnected
During gun maintenance, it may be helpful to trigger the
gun while the electrical harness is disconnected. To do
so, perform the following steps.
1. Connect gun to air supply.
2. Using a small allen key, insert the small end into the
center hole of the exhaust valve cap (217) located
behind the trigger.

9. Clean screen screw and screen with solvent. If iso
build-up exists on screen screw, clean with brass
wire brush as necessary.
10. Clean gun block with solvent.
11. Remove iso check valve gasket using gasket
removal tool (611).
12. Using check valve removal tool (612), remove iso
check valve.
13. Clean all parts with solvent then blow dry with compressed air and reassemble.

217
3. Pull trigger to depress allen key into muffler and
activate the valving mechanism. The gun should
trigger and the valving rod should pull back.

312888D

Troubleshooting

Troubleshooting
Problem
Interruption of flow of one material
Change of color in mixed product
Only one component coming out of
gun

Cause
Running out of material

Supply more material to proportioner

Materials in proportioner are too viscous

Check with material supplier for recommended temperature range that
should be maintained to control viscosity.

Filter screens are clogged

Flush gun. See Flush Gun, page 14.

Materials in proportioner are too viscous

Check with material supplier for recommended temperature range that
should be maintained to control viscosity.

Impinger slots are clogged

See Impingers, page 19, for service
instructions.

Valving rod is worn

Perform Pressure Check Valving
Rod Resilient Sleeve procedure;
see page 21.

Valving rod or throat is
damaged

Perform Pressure Check Valving
Rod Resilient Sleeve procedure;
see page 21.

Poor spray pattern

Minor weepage around throat in gun
block

312888D

Solution

Repair

Repair
3. Remove front impinger from front packing. It is not
necessary to remove front packing if no damage to
packing is evident or suspected.
Front Impinger

CAUTION
Shutdown proportioner and allow chemicals to cool
before servicing gun.
Clean A and R components in separate containers to
avoid cross contamination.
Tools Required

•
•
•
•
•
•
•
•
•
•
•
•
•

flush can
impinger cleanout brush
5/16 in. nut driver
utility knife
pin vise without cleanout spade
gun block component hole cleanout brush
check valve removal tool
throat wrench
pattern control tip front impinger packing seal
cleanout tool
gasket removal tool
wooden stick
pry tool/rear impinger wrench
pressure flush kit (optional)

Pattern Control Tip
1. Set safety stop to SERVICE (CLOSED).
CAUTION
Ensure safety stop is set to SERVICE (CLOSED)
while removing pattern control tip. If it is not, the resilient sleeve of the valving rod may be damaged.
2. Loosen pattern control tip with a 10 in. adjustable
wrench. Once loosened, unthread tip by hand.
If front packing and/or front impinger remain on
valving rod when pattern control tip is removed,
release trigger and carefully slide these parts off
valving rod.

Front Packing

Pattern
Control
Tip

4. Remove pattern control tip o-ring and front packing
from pattern control tip. If packing cannot be
removed by hand, use pliers. However, this will
require replacement of packings.
O-ring
Front Impinger

Pattern
Control
Tip

Front Packing

5. Use pattern control tip cleanout tool to clean inside
walls of tip. Flush tip and clean surrounding external
surface.
6. Set pattern control tip and front impinger and packing aside.
Reassembly instructions are included in
Impingers, page 19.

Screen Screw and Port Closure
Plugs
1. Perform Pattern Control Tip steps; see page 16.
2. Use a 5/16 in. nut driver to remove screen screw
mounting screw while holding large hex head of
screen screw with finger or against solid surface.

312888D

Repair

3. Slide screen screw assembly out of gun block. Allow
excess Isocyanate material to drain.

2. Remove spring retainer case by grasping handle
firmly and pushing in on retainer case with palm of
hand. Simultaneously rotate case a quarter turn
counterclockwise to remove case from locking collar.

Port Closure Plug

Spring Retainer Case

Screen Screw
Mounting Screw

4. Flush assembly and place it in gun cleaner.
5. Remove port closure plugs with nut driver. These
are installed using high-strength sealant, apply heat
to help break free when removing.
6. Clean port closure plugs with gun cleaner and
inspect for damage. Replace if necessary. Apply
sealant (49) to plugs before reinstalling.
7. Remove screen from screen screw. Soak in gun
cleaner or replace if clogged or dirty.
8. Clean screen screw cavity. Clean with clean out
drills and flush with gun cleaner. If more than 20% of
screen is blocked, replace screen.
9. Inspect screen screw seal and closure screw gasket
for damage. Replace if necessary.

3. Cover open end of air cylinder with hand protected
by a cloth and depress gun trigger.

The following two steps must be accomplished next to
prevent accidental operation of gun.

4. Disconnect airline to gun. Pull back on outer ring of
quick disconnect coupling to disconnect air from
gun.
5. Disconnect electrical harness from gun.
6. Examine resilient sleeve assembly for damage.
Structural damage or wear will show as:

10. Reinstall screen screw assembly and tighten mounting screw.

•
•

11. Insert port closure plugs.

•

Valving Rod and Resilient
Sleeve
Disassembly and Cleaning

scratches or chaffing of outside wall of sleeve;
movement or extrusion of sleeve in either
threaded mandrils;
reduction in sleeve diameter.
A uniform depression of equal depth around diameter of sealing point of throat is normal.

7. If any damage or wear exists, replace both valving
rod resilient sleeve and front packing.
8. Remove valving rod resilient sleeve assembly if it
needs to be replaced.

Inadvertent actuation of trigger with spring retainer
case removed could cause serious injury.

a. Use a 6 in. adjustable wrench to unthread coupler toward resilient sleeve. If necessary, use a
5/16 in. nut driver to hold valving rod.

1. Follow Pressure Relief Procedure, page 12.
b.

312888D

Once coupler is loose, unthread resilient sleeve
assembly.

Repair

Reassembly
1. If valving rod resilient sleeve assembly was removed
or is being replaced, use the following steps:
a. Thread coupler onto resilient sleeve assembly
by hand as far as it will go toward sleeve. There
should be approximately 1/16 in. (1.5 mm)
clearance between coupler and valving rod.
b.

Use a 6 in. adjustable wrench and a 5/16 in. nut
driver to securely tighten coupler.

Coupling Block and Check
Valves
Disassembly
1. Follow Pressure Relief Procedure, page 12.
2. Use 5/16 in. nut driver to remove coupling block
mounting screw, and separate gun from coupling
block.

Coupler

1/16 in.
Coupling
Block
2. Align slot on valving rod with pin in cylinder and
push valving rod assembly all the way forward then
rotate 180 degrees.
There should be some resistance when pushing
valving rod assembly through throat.

3. Flush both material ports on face of coupling block
to prevent material buildup.
4. Remove check valve gasket. Place end of coupling
block gasket removal tool into notches next to gaskets and pry them out.

Valving Rod Retainer Case
Valving Rod Assembly

Valving Rod
Closure Spring

Check
Valves

Coupling
Block Gaskets

5. Flush open ports and check valves with gun cleaner.
3. Insert valving rod closure spring into cylinder and
over end of valving rod.
4. Push valving rod retainer case over spring into cylinder and rotate clockwise (approximately a quarter
rotation) until retainer case snaps into position.

6. Remove check valves by pressing them inward and
popping them out, or by using the magnet.
Iso check valve is notched for identification purposes.

312888D

Repair

7. If material buildup prevents easy removal, use
three-pronged end of check valve removal tool to
grasp check valve and turn free.
Opposite end of check valve removal tool is
designed to clean check valve cavity.

Impingers
Disassembly and Cleaning
1. Follow Pressure Relief Procedure, page 12.
2. Perform Pattern Control Tip steps; see page 16.

8. Place all parts in gun cleaner and flush exposed
ports.

Reassembly
1. Inspect seats on gaskets for nicks. Replace seats if
damaged.

3. Remove rear impinger from throat. Hold throat in
place with throat wrench (604) and use rear
impinger wrench 28576 to loosen impinger from
throat. Continue un-threading by hand.
Rear Impinger
Throat

2. Insert check valves (notched valve on left side) and
gaskets into gun block pressing gaskets in place.
Gaskets are designed for use on either side. Carefully check angular seat to ensure sealing point of
check valve.

3. Place coupling block to gun and use 5/16 in. nut
driver to install coupling block mounting screw.

4. Flush gun block with gun cleaner.
5. Inspect seating surface (area around center hole)
within throat for damage. Use a soft object, such as
a wooden stick or soft brush, to clean surface.
CAUTION
Never use a sharp or hard metal object for cleaning
impingers or throat. Seating surface of throat is highly
polished to ensure sealing of resilient sleeve.
6. Use impinger cleaning brush (608) to clean both
external and internal threads of throat.
7. Use impinger cleaning brush to clean rear and front
impingers. Use cleanout spade to clean each injection slot of both impingers.

Injection Slots

Rear Impinger

Front Impinger

Reassembly
1. Assemble rear impinger into throat. Thread slotted
end of rear impinger into female thread of throat.
Hold throat in place with throat wrench and use rear
impinger wrench to tighten impinger into throat.

312888D

Repair

2. Thread throat assembly by hand into gun block. Use
throat wrench to tighten.
Front impinger should contact throat surface about
1/2 to 3/4 turns from actual seating of throat to gun
block surface. This compression creates the internal seal within front portion of chamber.

3. Assemble front impinger and pattern control tip.
Insert front packing into pattern control tip. Place
front impinger over end of front packing. Place pattern control tip o-ring into groove on pattern control
tip.
4. Engage safety stop, see Safety Stop on page 7.
Press and hold trigger then hand-tighten pattern
control tip into gun block.
5. Release trigger to align components then press and
hold trigger. Use 10 in. adjustable wrench to tighten
pattern control tip about 1/8-turn. Release trigger.
Repeat until the pattern control tip is snug on the
gun block.
If after finishing step 5 the valving rod is not protruding at least 1/64 in. from the end of the pattern
control tip, the pattern control tip will need to be
removed then steps 4 and 5 repeated. The pattern
control tip will need to be tightened in 1/16- or
1/32-turn increments.

Gun Block
In severe cases of material buildup, it may be necessary
to remove the gun block and soak it in gun cleaner.
1. Follow Pressure Relief Procedure, page 12.
2. Remove the pattern control tip and front impinger;
see Pattern Control Tip, page 16.
3. Remove coupling block and check valves; see Coupling Block and Check Valves, page 18.
4. Remove rear impinger and throat; Impingers, page
19.
5. Remove gun block mounting screws.

Mounting Screws

6. Remove resin (rear) seal screw and resin seal
o-rings.

Pattern
Control Tip

312888D

Repair

7. Soak gun block in gun cleaner.
CAUTION

6. Set safety stop to SERVICE (CLOSED), and then
pull trigger to determine if weepage occurs in this
position.

Do not allow gun block or component parts to soak in
gun cleaner for extended periods of time, such as
overnight, as certain solvents may cause corrosion or
pitting.
Do not soak gun block o-rings in gun cleaner. To clean
o-rings, dip in gun cleaner and immediately wipe dry.
Weepage
8. Reassemble resin (rear) seal screw and resin seal
o-rings into gun block.
9. Reinstall gun block using gun block mounting
screws.

Pressure Check Valving Rod
Resilient Sleeve
Perform this test to check seal created by interference fit
between resilient sleeve and opening in throat.

7. If weepage is observed in either step, replace valving rod and/or throat. See Valving Rod and Resilient Sleeve, page 17, to replace valving rod. See
Impingers, page 19, to replace throat.
If throat is not properly seated in gun block, material leakage will occur around outer area of throat. If
this occurs, insert throat wrench over resilient
sleeve and tighten throat.

1. Follow Pressure Relief Procedure, page 12.
2. Remove the pattern control tip and front impinger;
see Pattern Control Tip, page 16.

8. Close resin manual valve.

3. Remove coupling block and check valves; see Coupling Block and Check Valves, page 18.
4. Remove rear impinger and throat; Impingers, page
19.
5. Turn on proportioner, and with only the resin manual
valve open, determine if there are resin leaks at
front (Iso) surface of throat.

Should be protruding

312888D

Repair

312888D

Parts

Parts
AR Pour Gun 255828

Impinger Options

Impinger (C Size)
Front

Rear

Part

Style

Part

Style

Orifice
Area
Factor

299974

23-B-1

299990

23-B-1

900

299975

33-B-1

None

33-B-1

1200

299976

33-C-1

299991

33-C-1

1800

299977

34-C-1

299992

34-C-1

2400

299980

46-B-1

299995

46-B-1

3000

299978

36-C-1

299993

36-C-1

3600

None

46-C-1

299996

46-C-1

4500

299982

48-C-1

299997

48-C-1

6000

299983

58-C-1

299999

58-C-1

7200

Table 1: Impinger Options - C Size
Ref
BA
BB
BC

Part
255827
253728
285771

Description
GUN, auto AR-C
KIT, AR gun tool (not shown)
BLOCK, AR coupling

Qty
1
1
1

Impinger (D Size)
Front

Rear

Part

Style

Part

Style

Orifice
Area
Factor

299979

33-C-1

None

33-C-1

1800

None

36-C-1

299994

36-C-1

3600

None

48-C-1

299998

48-C-1

6000

None

58-C-1

261789

58-C-1

7200

299984

59-D-1

None

59-D-1

10800

299985

66-D-1

285750

66-D-1

8400

None

78-D-1

285751

78-D-1

12800

261790

79-D-1

None

79-D-1

14400

299987

90-D-1

285752

90-D-1

18000

299988

94-D-1

None

94-D-1

25200

Table 2: Impinger Options - D Size

312888D

29 15

1†

2†

3†

4†

33◆

36◆

18
19

Parts

Auto AR-C Gun 255827

312888D

Parts

Ref
1†
2†
3†
4†
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25

Part
296621
296622
295595
295175
296128
295623
295624
297307
295693
295596
208536
297308
296129
299923
297150
299925
299951
298354
299475
299960
299962
297312
296136
299966
297313

Description
SEAL, screw, screen
SCREEN, block, gun
RING, retaining
SCREW, screen, gun block
GASKET, block, gasket
VALVE, check, A
VALVE, check, R
SCREW, mounting, 1 in.
PLUG, pipe
PLUG, coupler
COUPLER, line, air
SCREW, closure, A-port
SCREW, closure, R-port
BLOCK, gun spacer w/stud
SCREW, cap, socket head
HANDLE, gun mounting plate
TRIGGER, lever
PIN, mounting
RETAINER
CYLINDER, air assy
ROD, valving
COLLAR, lock
SLEEVE
RETAINER, spring case assy
SPRING, die, heavy duty

Qty
1
1
1
1
2
1
1
1
1
1
1
1
1
3
3
1
1
1
1
1
1
1
1
1
1

Ref
26
27
28
29
31
32
33
34
35
36
37
38

Part
299969
297314
299970
111603
296137
296138
103648
298355
296140
298356
298117
299908

39
40
41

256213
285795
299973

102969

Description
COUPLING, connecting
O-RING, fluoroelastomer
STOP, notched
PACKING, o-ring
PACKING, front
PACKING, throat
PACKING, o-ring
SEAL, retainer, 250
PACKING, R
SEAL, screw, 250
SCREW, 1/4-28 x 1 bhcs-nyloc
SCREW, 1/4-28 x 1 1/4
shcs-nyloc
HANDLE, auto ar gun
BLOCK, gun assy
TIP, 250 pattern control, also
shown on page 24
IMPINGER, front; see
Impinger Options on page 23
for part numbers
IMPINGER, rear; see
Impinger Options on page 23
for part numbers
ADHESIVE, anaerobic

Qty
1
2
1
1
1
1
1
1
1
1
2
1
1
1
1
1

† Parts included in Kit 296624, available separately.
◆ Parts included in Kit 298357, available separately.

312888D

222

203

218

227

201

229

220

224

201

221

225

223
226

203

204

228

219

235

233

209

206

202

205

211

216

231

205

208

210

215

217

210

212

234

232

207
214

213

230
230

Parts

Gun Handle Assembly 256213

312888D

Parts

Ref
201
202
203
204
205
206
207
208
209

Part
298116
108195
C19950
296066
106555
106560
C20988
112085
299917

210
211
212
213
214
215
216
217

295685
299926
299927
299928
299929
299930
299931
299932

Description
SCREW, 4-40 x 3/4 shcs
PACKING, o-ring
SCREW, cap, sch
O-RING, piston, pump
PACKING, o-ring
PACKING, o ring
PACKING, o-ring
PACKING, o-ring
SCREW, 5-40 x 3/8
button-hd cap
O-RING
TRIGGER, bushing
SPRING,
TRIGGER, actuator pin
SPOOL
RING, seal
ROD, piston
VALVE, exhaust cap

Qty
3
1
4
3
3
1
1
1
1
2
1
1
1
1
1
1
1

Ref
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235

Part
299933
256214
299936
299937
299938
299939
299940
15M966
299135
299020
102279
299948
299475
299971
285776
295439
114375

Description
INSULATOR, circuit board
WIRE, gun harness assy
MANIFOLD, air
SCREW, 2-56 x 7/16 phms
COVER
PLATE, rear cover
GASKET, pilot valve
BOARD, assy
SWITCH, arm lever
SCREW, shoulder
SCREW, set, socket
VALVE, solenoid valve assy
RETAINER
HOSE, 1/4 x 2 in. (mxf) air
WASHER, packing washer
LINER, valve, spool
PACKING, o-ring
HANDLE

Qty
1
1
1
4
1
1
1
1
1
1
1
1
2
1
1
1
1
1

Air Cylinder Assembly 299960
407

406
403

402
404
401
403
405

Ref
401
402
403
404
405
406
407

Part
299954
297309
299956
299957
299959
297310
297311

312888D

Description
COVER, dust
SEAL, u-cup, fluoroelastomer
CYLINDER, air
PISTON, assy
CYLINDER, flange assy.
O-RING, fluoroelastomer
SEAL, u-cup, fluoroelastomer

Qty
1
1
1
1
1
1
1

Parts

Coupling Block Assembly 285771
506
503

505

Ref
501
502
503
504
505

Part
295619
295693

506

117595

Ref
601
602
603
604
605
606
607
608
609
610
611
612

Part
117642
117661
118665
285763

117506

Description
SCREW, mounting
PLUG, pipe (285771 only)
VALVE, manual
BLOCK, coupling
FITTING, swivel, 1/4 npt x #6
JIC
FITTING, swivel, 1/4 npt x #5
JIC

Qty
1
2
2
1
1
1

501

502

504

AR Gun Tool Kit 253728
604

607

606

285765
285767
295898
295935
296187
296191
297973

Description
Qty
TOOL, nut driver
1
PIN, vise
1
TUBE, grease, 4 oz
1
TOOL, throat wrench
1
KIT, cleanout drills
1
TOOL, 250 rear impinger wrench
1
TOOL, 250 pct/imp cleanout
1
BRUSH, cleanout, impinger
1
KIT, spade, cleanout
1
BRUSH, bore, cleanout, gun block
1
TOOL, removal, gasket
1
TOOL, removal, valve
1

609
611
612

312888D

Parts

AR-D Conversion Kit 24A023
See Repair section on page 16 for conversion kit
parts installation.

Ref
701
702
703
704
705
706
707
708
709

Part
299961
297141
299968
285755
285756
297143
299989
297142
299972

312888D

Description
Qty
CYLINDER, air assy (AR-D)
1
SLEEVE, AR-D (375)
1
SPRING, die, heavy duty, medium
1
SEAL, 375 resin retainer
1
SEAL, 375 resin screw
1
PACKING
1
NOZZLE, 375 throat
1
PACKING, front
1
TIP, 375 pattern control
1

37)4#(2%452.
$)30%.3%!#4)6%
$)30%.3%2%15%34!#4)6%

3/,%./)$6!,6%

#/),2%452.
#!3%
$)30%.3%#/--!.$

!2'5.(!.$,%

'5.#)2#5)4"/!2$

Electrical Diagram

ti12351a

312888D

Technical Data

Technical Data
Category

Data

Maximum Fluid Working Pressure
Minimum Air Inlet Pressure
Maximum Air Inlet Pressure
Maximum Output (flow rate) †
Air Inlet Size
A Component (ISO) Inlet Size
R Component (Resin) Inlet Size
Length
Height
Width
Weight
Wetted Parts

2000 psi (13.8 MPa, 138 bar)
90 psi (0.62 MPa, 6.2 bar)
120 psi (0.84 MPa, 8.4 bar)
40 lb/min (18.1 kg/min)
1/4 npt, quick disconnect nipple
#5 JIC
#6 JIC
12.5 in. (318 mm)
9.5 in. (241 mm)
2.8 in. (71 mm)
6.7 lbs (3.0 kg)
Stainless Steel, Zinc Plated Carbon Steel, Black Oxide
Coated Carbon Steel, Tool Steel, 6/6 Nylon, Acetal

† Flow rate depends on pump sizes, hose diameter, hose length, and impingers

Performance Charts
Impingers Performance Chart

Pressure in psi (MPa, bar)

2000
(13.8, 138)

KEY
A = AR-C 23-B-1 impingers
B = AR-C 36-C-1 Impingers
C = AR-C 58-C-1 impingers
D = AR-D 59-D-1 front
impinger and AR-D 58-C-1
rear impinger

1500
(10.3, 103)

1000
(6.9, 69)

A
B

500
(3.4, 34)

C
D

5
(2.3)

(6.8)

(11.4)

(15.9)

(20.5)

(25.0)

Flow Rate in lb/min (kg/min)

Impingers tested with 100-150 centipoise Mesamoll with a specific gravity of
1.055.

312888D

Graco Standard Warranty
Graco warrants all equipment referenced in this document which is manufactured by Graco and bearing its name to be free from defects in
material and workmanship on the date of sale to the original purchaser for use. With the exception of any special, extended, or limited warranty
published by Graco, Graco will, for a period of twelve months from the date of sale, repair or replace any part of the equipment determined by
Graco to be defective. This warranty applies only when the equipment is installed, operated and maintained in accordance with Graco’s written
recommendations.
This warranty does not cover, and Graco shall not be liable for general wear and tear, or any malfunction, damage or wear caused by faulty
installation, misapplication, abrasion, corrosion, inadequate or improper maintenance, negligence, accident, tampering, or substitution of
non-Graco component parts. Nor shall Graco be liable for malfunction, damage or wear caused by the incompatibility of Graco equipment with
structures, accessories, equipment or materials not supplied by Graco, or the improper design, manufacture, installation, operation or
maintenance of structures, accessories, equipment or materials not supplied by Graco.
This warranty is conditioned upon the prepaid return of the equipment claimed to be defective to an authorized Graco distributor for verification of
the claimed defect. If the claimed defect is verified, Graco will repair or replace free of charge any defective parts. The equipment will be returned
to the original purchaser transportation prepaid. If inspection of the equipment does not disclose any defect in material or workmanship, repairs will
be made at a reasonable charge, which charges may include the costs of parts, labor, and transportation.
THIS WARRANTY IS EXCLUSIVE, AND IS IN LIEU OF ANY OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
TO WARRANTY OF MERCHANTABILITY OR WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE.
Graco’s sole obligation and buyer’s sole remedy for any breach of warranty shall be as set forth above. The buyer agrees that no other remedy
(including, but not limited to, incidental or consequential damages for lost profits, lost sales, injury to person or property, or any other incidental or
consequential loss) shall be available. Any action for breach of warranty must be brought within two (2) years of the date of sale.
GRACO MAKES NO WARRANTY, AND DISCLAIMS ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE, IN CONNECTION WITH ACCESSORIES, EQUIPMENT, MATERIALS OR COMPONENTS SOLD BUT NOT
MANUFACTURED BY GRACO. These items sold, but not manufactured by Graco (such as electric motors, switches, hose, etc.), are subject to
the warranty, if any, of their manufacturer. Graco will provide purchaser with reasonable assistance in making any claim for breach of these
warranties.
In no event will Graco be liable for indirect, incidental, special or consequential damages resulting from Graco supplying equipment hereunder, or
the furnishing, performance, or use of any products or other goods sold hereto, whether due to a breach of contract, breach of warranty, the
negligence of Graco, or otherwise.
FOR GRACO CANADA CUSTOMERS
The Parties acknowledge that they have required that the present document, as well as all documents, notices and legal proceedings entered into,
given or instituted pursuant hereto or relating directly or indirectly hereto, be drawn up in English. Les parties reconnaissent avoir convenu que la
rédaction du présente document sera en Anglais, ainsi que tous documents, avis et procédures judiciaires exécutés, donnés ou intentés, à la suite
de ou en rapport, directement ou indirectement, avec les procédures concernées.

Graco Information
TO PLACE AN ORDER, contact your Graco distributor or call to identify the nearest distributor.
Phone: 612-623-6921 or Toll Free: 1-800-328-0211 Fax: 612-378-3505

All written and visual data contained in this document reflects the latest product information available at the time of publication.
Graco reserves the right to make changes at any time without notice.
This manual contains English. MM 312888

Graco Headquarters: Minneapolis
International Offices: Belgium, China, Japan, Korea
GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440-1441
Copyright 2008, Graco Inc. is registered to I.S. EN ISO 9001
www.graco.com
Revised 11/2008

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Marked                          : True
Keywords                        : "AR Pour Gun, Operation, Parts, 312888, 255828"
Copyright                       : 2008, Rev B 5/2008, Rev C 6/2008
Job Ref                         : Z039186
Web Statement                   : AR Pour Gun, Operation, Parts, 312888, 255828
Producer                        : Acrobat Distiller 7.0.5 (Windows)
Modify Date                     : 2013:10:01 17:30:43-05:00
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Create Date                     : 2005:04:27 11:19:54Z
Metadata Date                   : 2013:10:01 17:30:43-05:00
Format                          : application/pdf
Title                           : 312888D AR Pour Gun, Operartion-Parts, English
Creator                         : Ryan Stellmaker
Description                     : AR Pour Gun, Operation, Parts, 312888, 255828
Subject                         : AR Pour Gun, Operation, Parts, 312888, 255828
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Page Count                      : 32
Author                          : Ryan Stellmaker

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Graco 312888D Ar Pour Gun Users Manual Gun, Operartion Parts, English

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